What was found
PERFORMED SOAP SAMPLE DUE TO FILTER BYPASSED. SAMPLE CAME BACK NORMAL. PERFORMED ANOTHER SOAP SAMPLE 50 HOURS LATER AND FILTER FAILED DELTA P-CHECK. RESULTS CAME BACK (INSPECT THIS ENGINE IMMEDIATELY) INSTALLED LOANER ENGINE. ORIGINAL ENGINE HAD NR 1, NR 3, NR 4 AND NR 5 CARBON SEALS REPLACED. RE-INSTALLED ORIGINAL ENGINE AFTER REPAIRE. 25 HOUR SOAP SAMPLE RESULTS ARE NORMAL. PROBABLE CAUSE IS PREMATURE WEAR/FAILURE OF CARBON SEALS. RECOMMEND IMPROVING CARBON SEAL MATERIAL AND QUALITY. (K)